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Compensation 990 is an independent service that uses public IRS Form 990 filings as its source data. We clean and standardize this information, but the original filings may contain errors or omissions. Years on this site refer to the organization’s fiscal year end date on the filing.

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Organizations Public & Societal Benefit California Independent System Operator Corporation

California Independent System Operator Corporation

Fiscal year ending 2021. Filed on November 15, 2022.

250 Outcropping Way
Folsom, California 95630

California Independent System Operator Corporation (EIN: 94-3274043) has filed an IRS Form 990 since at least fiscal year 2016. In its fiscal year 2021 IRS Form 990 filing, California Independent System Operator Corporation, a 501(c)(3) charitable organization, reported compensation for 28 out of 811 total employees. Among the employees shown here, the average compensation is $518,968. The highest compensated employee at California Independent System Operator Corporation is Mark Rothleder with fiscal year 2021 compensation of $1,161,572.

Revenue, expenses, and employee compensation

Revenue

$249,597,089

Expenses

$229,434,464

Employee compensation

$139,889,501
Revenue, expenses, and employee compensation over time

Reported Compensated Employees

Mark Rothleder
Senior Vice President and Chief Operating OFF
$1,161,572
$987,946 No related comp$173,626
Stephen Berberich
Chief Executive Officer Emeritus
$1,139,302
$1,071,776 No related comp$67,526
Elliot Mainzer
President and Chief Executive Officer
$938,188
$834,421 No related comp$103,767
Roger Collanton
Vice President, GEN CNSL and Chief COMP OFF
$915,596
$800,768 No related comp$114,828
Stacey Crowley
Vice President, External Affairs
$798,414
$695,020 No related comp$103,394
Petar Ristanovic
Vice President, Technology
$786,767
$786,767 No related compNo other comp
Ryan Seghesio
Vice President, CFO and Treasurer
$732,037
$613,511 No related comp$118,526
Neil Millar
Vice President, Infrastructure and OPS PLAN
$718,812
$600,642 No related comp$118,170
Jodi Ziemathis
Vice President, Human Resources
$682,218
$564,802 No related comp$117,416
Eric Schmitt
Vice President, Operations
$552,971
$507,636 No related comp$45,335
Khaled Abdul-Rahman
Vice President, PWR Systems and Market TECH
$539,064
$446,103 No related comp$92,961
Anna McKenna
Vice President, MKT Policy and Performance
$529,043
$442,973 No related comp$86,070

Benchmark Employee Compensation

Non-Employee Board Members

No board members were reported during this fiscal year.

Contractors

Siemens Industry Inc.
Engineering
$11,983,842
Corestaff Services
Temporary Staffing
$3,944,016
Open Access Technology Internationa
Consulting
$3,173,683
Att
Telecomm.
$3,102,704
Teksystems Inc.
Consulting
$2,471,116

Mission Statement

TO ENSURE EFFICIENT USE AND RELIABLE OPERATION OF THE ELECTRIC TRANSMISSION GRID OPERATED BY THE CALIFORNIA ISO, CONSISTENT WITH THE CALIFORNIA PUBLIC UTILITY CODE, CHAPTER 2.3 PART 1, DIVISION 1. (CONTINUED ON SCHEDULE O.)THE ISO DOES NOT OWN TRANSMISSION FACILITIES, BUT IT CONTROLS THE OPERATION OF A NETWORK OF TRANSMISSION FACILITIES LOCATED THROUGHOUT MOST OF CALIFORNIA, AND ALSO CERTAIN TRANSMISSION FACILITIES LOCATED IN NEVADA, THE OWNERS OF WHICH HAVE TRANSFERRED OPERATIONAL CONTROL TO THE CALIFORNIA ISO. FOR THE BENEFIT OF OUR CUSTOMERS, WE:- OPERATE THE GRID RELIABLY AND EFFICIENTLY;- PROVIDE FAIR AND OPEN TRANSMISSION ACCESS;- PROMOTE ENVIRONMENTAL STEWARDSHIP; AND- FACILITATE EFFECTIVE MARKETS AND PROMOTE INFRASTRUCTURE DEVELOPMENT, ALL THROUGH THE PROVISION OF TIMELY AND ACCURATE INFORMATION.

Revisions to this organization profile

November 10, 2025:
2024 California Independent System Operator Corporation 990 filed
November 13, 2024:
2023 California Independent System Operator Corporation 990 filed
November 10, 2023:
2022 California Independent System Operator Corporation 990 filed

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